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SUMMARY:Tidal Sculpting of Short-Period Exoplanets - Sarah Millholland - P
 rinceton University
DTSTART:20210524T130000Z
DTEND:20210524T140000Z
UID:TALK157984@talks.cam.ac.uk
CONTACT:Cleo Loi
DESCRIPTION:Multiple-planet systems composed of close-in super-Earth/sub-N
 eptune-sized planets are ubiquitous\, representing a dominant outcome of p
 lanet formation. This population exhibits predictable hallmarks of archite
 ctural regularity and uniformity\, such as low eccentricities and inclinat
 ions\, similar orbital spacings\, and intra-system correlations in planeta
 ry masses and radii. On top of this first-order structure\, however\, thes
 e systems also exhibit surprising anomalies that require explanation. Exam
 ples include (1) ultra-short period planets\, whose extremely-irradiated o
 rbits have been separated off from the rest of their systems\; (2) planets
  piled up wide of mean-motion resonances\; and (3) a subset of Neptune-siz
 ed planets that show signs of radius inflation. In this talk\, I will prop
 ose that tidal dynamics can account for these specific anomalies and more.
  Specifically\, I will discuss the critical role of enhanced tidal dissipa
 tion due to non-zero planetary axial tilts (obliquities)\, which arise by 
 way of prevalent dynamical resonances. I will highlight strategies for tes
 ting these tidal theories and observing obliquities directly in the future
 .
LOCATION:Online
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